What is an idiom that describes being very formal, serious and solemn?

Idioms that describe very regular, serious and solemn are: solemn, solemn, serious, unsmiling and serious.

1. Pronunciation: zhèng zhòng qí shì.

Explanation: solemn: cautious and serious. Describe a serious attitude when talking and doing things.

Source: Cao Qingxue Qin's "Dream of Red Mansions" The fourth time: "So if you are serious, you will enter the door in three days."

The boss turned to her with a mouthful of food and a serious question in his eyes.

2. Solemn pronunciation: zhuāng? yán? sù? mù

Explanation: solemn, solemn, solemn. Of a person's attitude, expression, etc.

Source: Fayuan Zhu Lin Volume XIII "Suggestions" is quoted from Bodhisattva Benjing: "Solemn self-nature makes it extremely unique." ?

Sentence: When the national flag is raised, people look at it solemnly with pious hearts.

3, serious pronunciation: y and b and n zhè ng j and ng

Explanation: It originally refers to the classics that conform to moral norms. Later used to describe a solemn attitude. Sometimes it's ironic.

Source: Jin Gehong's "Bao Puzi Hundred Schools": "Zheng Zheng is a deep moral sea, and catalpa is a deepening stream."

Sentence: Zhang San seems to be quite serious.

4, unsmiling pronunciation: bù gǒu yán xiào

Explanation: If: If, whatever. No kidding. Describe a serious attitude.

Source: On the Book of Rites Quli: "Don't climb high, don't go deep, be meticulous, don't laugh."

Sentence: Although my father is unsmiling, he is very kind to people.

5. Pronunciation: zhèng jīn wüI Zuo

Explanation: lapel: lapel; Sitting in danger: sit up straight. Get dressed and sit up straight. Describe a serious or reserved look.

Source: Historical Records Japanese Biography: "Zhong Song and Jia Yiqu knew that they were in danger."

Sentence: Today, he is sitting in danger, and his smiling face in a peaceful day is completely different.